DYK, That the President's Limo, called "The Beast", not only has tear gas
canisters, shotgun and other firepower, and grenade launchers, it, always
has 2 pints of blood of the President's blood type.
Also, it has its own airplane. The Secret Service makes use of a C-17 Globemaster transport aircraft to haul The Beast, a second limo and a heavily armored Chevrolet Suburban communications vehicle, any time the President is traveling. The Suburban is nicknamed Roadrunner and it is said to be a rolling communications office directly linked to a military satellite - hence the SATCOM dome festooned to its roof.
"The Beast", also, has many capabilities that are never disclosed. I wouldn't
be surprised if it could fly or convert to some type of boat.